Working Voltage: DC 6VChip: LM393, Carbon Dioxide Sensor Probe MG811Detect Range: 0-10000 ppmOutput Voltage: 0-2VWorking Temperature: -10C to +50CPCB Board Size: 40 x 25 x 30mmFeature: Signal Output IndicationDouble Signal Output: Analogue Signal Output and TTL Level Signal Output. Analogue signal output range 0-2V. It has high sensitivity and great selectivity to carbon dioxide. Application: Used in home environment, underground warehouse, tunnel, and great suitable for carbon dioxide (CO2) concentration control equipment.